2001 Chevy Silverado Error codes PO300, PO327 and PO440

Tiny
SLINKY_70
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
My check engine light is on. I had my truck scanned and it is reporting these error codes PO300. PO327 and PO440. Is there something in common with these?
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Wednesday, March 11th, 2009 AT 10:04 PM

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Tiny
BLUELIGHTNIN6
  • EXPERT
Hello
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P0300 Random/Multiple Cylinder Misfire Detected

P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0440 Evaporative Emission Control System Malfunction

Suspect a faulty knock sensor or faulty wiring to knock sensor. With a faulty knock sensor the computer may also pick up a random misfire, which will throw the code P0300 as well. However, code P0440 is not related to the first two codes. For this one, inspect the gas cap to make sure it is tightened properly and also inspect the gas cap seal. If OK here, inspect the vacuum line from the throttle body to the purge solenoid for leaks. The best way is with a smoke machine. There could also be an issue with the purge solenoid or the electrical connection to it. Post your results and I will follow up.

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Thursday, March 12th, 2009 AT 2:26 AM
Tiny
SLINKY_70
  • MEMBER
I will inspect those items thanks. It may be awhile before I get to the knock sensor. I believe those are under the intake manifold?

Thanks
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Thursday, March 12th, 2009 AT 12:40 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Except for the 4.3L and 8.1L engines, yes it is in the valley under the intake manifold. For the 4.3L engines it is on the rear of the engine block and for the 8.1L engines it is on the left side of the engine, under the exhaust manifold.

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Thursday, March 12th, 2009 AT 2:22 PM
Tiny
SLINKY_70
  • MEMBER
I had 3 problems.
There was a bad seal on the fuel pump.
There was a bad evap hose (crack in it) from fuel tank.
Replaced both knock sensors and harness and still got code 327 turns out one of the new sensors was bad also.
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Wednesday, April 15th, 2009 AT 9:51 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Glad you got it fixed, thanks for the info!

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Wednesday, April 15th, 2009 AT 11:15 PM

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